From 30796e18c29942c4d64bf89c4135c975393ec1ad Mon Sep 17 00:00:00 2001 From: Logan Gunthorpe Date: Fri, 10 Apr 2020 14:33:28 -0700 Subject: [PATCH] x86/mm: introduce __set_memory_prot() For use in the 32bit arch_add_memory() to set the pgprot type of the memory to add. Signed-off-by: Logan Gunthorpe Signed-off-by: Andrew Morton Reviewed-by: Dan Williams Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Dave Hansen Cc: Andy Lutomirski Cc: Peter Zijlstra Cc: Benjamin Herrenschmidt Cc: Catalin Marinas Cc: Christoph Hellwig Cc: David Hildenbrand Cc: Eric Badger Cc: Jason Gunthorpe Cc: Michael Ellerman Cc: Michal Hocko Cc: Paul Mackerras Cc: Will Deacon Link: http://lkml.kernel.org/r/20200306170846.9333-5-logang@deltatee.com Signed-off-by: Linus Torvalds --- arch/x86/include/asm/set_memory.h | 1 + arch/x86/mm/pat/set_memory.c | 13 +++++++++++++ 2 files changed, 14 insertions(+) diff --git a/arch/x86/include/asm/set_memory.h b/arch/x86/include/asm/set_memory.h index 950532ccbc4a..ec2c0a094b5d 100644 --- a/arch/x86/include/asm/set_memory.h +++ b/arch/x86/include/asm/set_memory.h @@ -34,6 +34,7 @@ * The caller is required to take care of these. */ +int __set_memory_prot(unsigned long addr, int numpages, pgprot_t prot); int _set_memory_uc(unsigned long addr, int numpages); int _set_memory_wc(unsigned long addr, int numpages); int _set_memory_wt(unsigned long addr, int numpages); diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 6d5424069e2b..59eca6a94ce7 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -1795,6 +1795,19 @@ static inline int cpa_clear_pages_array(struct page **pages, int numpages, CPA_PAGES_ARRAY, pages); } +/* + * _set_memory_prot is an internal helper for callers that have been passed + * a pgprot_t value from upper layers and a reservation has already been taken. + * If you want to set the pgprot to a specific page protocol, use the + * set_memory_xx() functions. + */ +int __set_memory_prot(unsigned long addr, int numpages, pgprot_t prot) +{ + return change_page_attr_set_clr(&addr, numpages, prot, + __pgprot(~pgprot_val(prot)), 0, 0, + NULL); +} + int _set_memory_uc(unsigned long addr, int numpages) { /* -- 2.30.2